Fuel gas absorption heat pump system control method and fuel gas absorption heat pump system

Abstract

The invention relates to the technical field of fuel gas absorption heat pump system control, and discloses a fuel gas absorption heat pump system control method and a fuel gas absorption heat pump system.The fuel gas absorption heat pump system control method comprises the steps that according to an absorber liquid level PID control loop, solution circulation is controlled, and an absorber liquid level PID control loop is controlled; an evaporation temperature PID (Proportion Integration Differentiation) control loop is adopted to control ammonia working medium circulation, a water supply temperature PID control loop is adopted to control water supply and return circulation so as to realize variable working condition and variable power self-adaptive operation, and a key regulation and control valve and a plurality of key liquid level, temperature, pressure and flow sensors are additionally arranged in the system; three-loop linkage control of evaporation temperature control, absorber liquid level control and water supply temperature control is introduced, self-adaptive control of the system is achieved, automatic adjustment and efficient operation are achieved along with changes of environment temperature and changes of heat supply power requirements, and efficient defrosting control and start and stop control can also be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas absorption heat pump systems, and in particular to a gas absorption heat pump system control method and a gas absorption heat pump system. Background Art

[0002] Building energy consumption in my country accounts for about 23% of the total energy consumption. With the accelerated development of urbanization and the improvement of residents' living standards, building energy consumption will further increase. Among the building energy consumption, air conditioning, heating and hot water energy consumption account for the largest proportion, especially in northern winter urban heating, which accounts for about 40% of building energy consumption. Coal-fired systems produce a large amount of particulate matter, which is the main cause of haze and does not meet the needs of energy conservation, emission reduction and environmental protection. The widely used gas boiler system has an exhaust temperature of up to 150-200℃, which causes huge energy waste. Its primary energy efficiency is generally between 0.7 and 0.8. Many literatures focus on the recovery of flue gas waste heat from gas boiler systems. The main means include air preheaters, condensing boilers and absorption heat pumps. For systems using air preheaters, since there is no phase change on the air side and most of the waste heat on the flue gas side comes from steam condensation, the recovery effect is very limited; for systems using condensing boilers, since the hot water temperature is generally around 50-60℃, which is very close to the dew point temperature of the flue gas, most of the flue gas latent heat cannot be recovered, and the improvement in primary energy efficiency is very small.

[0003] The gas absorption heat pump system introduces medium-pressure evaporation and medium-pressure absorption on the basis of the traditional single-effect absorption system, which can enhance the adaptability of the system in low-temperature ambient temperatures, improve the performance of the system in low-temperature ambient temperatures, make full use of the waste heat of low-temperature flue gas recovered from the gas boiler, enhance the heat recovery effect of the system solution, and improve the system efficiency. After the introduction of medium-pressure evaporation and medium-pressure absorption, the system becomes complicated, and generally adopts a fixed combustion power and evaporation temperature mode to ensure the efficient operation of the system. When the ambient temperature changes greatly and the power adjustment range is large, the overall energy efficiency of the system is not high. Summary of the invention

[0004] Based on this, it is necessary to address the technical problem that the comprehensive energy efficiency of the gas absorption heat pump system in the prior art is low, and propose a gas absorption heat pump system control method and a gas absorption heat pump system.

[0005] In a first aspect, a gas absorption heat pump system control method is provided, the method comprising:

[0006] The absorber liquid level PID control loop is used to control the solution circulation;

[0007] The evaporation temperature PID control loop is used to control the ammonia working medium cycle;

[0008] The water supply temperature PID control loop is used to control the supply and return water circulation to achieve adaptive operation under variable operating conditions and variable power.

[0009] In a second aspect, a gas absorption heat pump system control device is provided, the device comprising:

[0010] A first control module is used to control the solution circulation by using an absorber liquid level PID control loop;

[0011] The second control module is used to control the ammonia working medium cycle by using an evaporation temperature PID control loop;

[0012] The third control module is used to control the supply and return water circulation by adopting the water supply temperature PID control loop to achieve variable working condition and variable power adaptive operation.

[0013] In a third aspect, a gas absorption heat pump system is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned gas absorption heat pump system control method when executing the computer program.

[0014] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned gas absorption heat pump system control method are implemented.

[0015] The gas absorption heat pump system control method proposed in the present invention is applied to the gas absorption heat pump system, and the system includes: solution circulation, ammonia working medium circulation, gas-flue gas process, and supply and return water circulation; the solution circulation includes the first outlet of the generator being connected to one end of the electronic expansion valve V4, a thermometer T1 is arranged between the first outlet of the generator and one end of the electronic expansion valve V4, the other end of the electronic expansion valve V4 is connected to the first inlet of the medium-pressure absorber, the first outlet of the medium-pressure absorber is connected to one end of the electronic expansion valve V3, a thermometer T7 is arranged between the first outlet of the medium-pressure absorber and one end of the electronic expansion valve V3, the other end of the electronic expansion valve V3 is connected to the first inlet of the absorber, the absorber is provided with a liquid level meter L1, and the first The outlet of the absorber is connected to one end of the circulating pump M1, a thermometer T8 is arranged between the first outlet of the absorber and one end of the circulating pump M1, the other end of the circulating pump M1 is connected to the second inlet of the medium-pressure absorber through a one-way valve, the second outlet of the medium-pressure absorber is connected to the first inlet of the generator, the first outlet of the medium-pressure absorber is connected to one end of the defrost valve V5, the other end of the defrost valve V5 is connected to the first inlet of the evaporator, and the generator is provided with a pressure gauge P1; the ammonia working medium circulation includes the generator being connected to the first inlet of the rectifier through a two-way pipeline, the first outlet of the rectifier is connected to the first inlet of the condenser, the first outlet of the condenser is connected to the first inlet of the subcooler, the first outlet of the subcooler is connected to one end of the electronic expansion valve V2, and the electronic expansion The other end of the valve V2 is connected to the first inlet of the medium-pressure evaporator, the first outlet of the medium-pressure evaporator is connected to the first inlet of the separator, the first outlet of the separator is connected to one end of the electronic expansion valve V1, the other end of the electronic expansion valve V1 is connected to one end of the evaporator, a pressure gauge P3 and a thermometer T2 are arranged between the other end of the electronic expansion valve V1 and one end of the evaporator, the other end of the evaporator is connected to the second inlet of the subcooler, a thermometer T3 is arranged between the other end of the evaporator and the second inlet of the subcooler, the second outlet of the subcooler is connected to the second inlet of the absorber, the second outlet of the separator is connected to the third inlet of the medium-pressure absorber through a one-way valve, the separator is provided with a pressure gauge P2 and a liquid level gauge L2, the evaporator is provided with a temperature gauge P2 and a liquid level gauge L2. The gas-flue gas process includes a gas inlet connected to one end of the burner, the other end of the burner connected to the second inlet of the generator, the second outlet of the generator connected to the first inlet of the flue gas heat exchanger, the first outlet of the flue gas heat exchanger connected to the second inlet of the medium-pressure evaporator, and the second outlet of the medium-pressure evaporator connected to the flue gas outlet; the supply and return water cycle includes a return water port connected to the second inlet of the condenser, a thermometer T4 is provided at the return water port, the second outlet of the condenser is connected to the third inlet of the absorber, the second outlet of the absorber is connected to the second inlet of the rectifier, the second outlet of the rectifier is connected to the second inlet of the flue gas heat exchanger, the second outlet of the flue gas heat exchanger is connected to the water supply port, and a thermometer T5 and a water flow meter F1 are provided at the water supply port.The control method of the gas absorption heat pump system adopts the absorber liquid level PID control loop to control the solution circulation, adopts the evaporation temperature PID control loop to control the ammonia working medium circulation, and adopts the water supply temperature PID control loop to control the supply and return water circulation, so as to realize variable working condition and variable power adaptive operation, add key control valves and multiple key liquid level, temperature, pressure and flow sensors in the system; introduce the three-loop linkage control of evaporation temperature control, absorber liquid level control and water supply temperature control to realize system adaptive control, automatically adjust and operate efficiently with the changes in ambient temperature and heating power demand, and realize efficient defrost control and start and stop control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] in:

[0018] Figure 1 A schematic diagram of a cycle structure of a gas absorption heat pump system of a gas absorption heat pump system control method in one embodiment;

[0019] Figure 2 is a flow chart of a method for controlling a gas absorption heat pump system in one embodiment;

[0020] Figure 3 It is a structural block diagram of a gas absorption heat pump system control device in one embodiment;

[0021] Figure 4 1 is a structural block diagram of a gas absorption heat pump system in one embodiment. DETAILED DESCRIPTION

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The gas absorption heat pump system control method provided in the embodiment of the present invention can be applied in the following aspects: Figure 1 In the gas absorption heat pump system, refer to Figure 1 The gas absorption heat pump system includes: solution circulation, ammonia working medium circulation, gas-flue gas process, and supply and return water circulation;

[0026] The solution circulation includes that the first outlet of the generator is connected to one end of the electronic expansion valve V4, a thermometer T1 is arranged between the first outlet of the generator and one end of the electronic expansion valve V4, the other end of the electronic expansion valve V4 is connected to the first inlet of the medium-pressure absorber, the first outlet of the medium-pressure absorber is connected to one end of the electronic expansion valve V3, a thermometer T7 is arranged between the first outlet of the medium-pressure absorber and one end of the electronic expansion valve V3, the other end of the electronic expansion valve V3 is connected to the first inlet of the absorber, the absorber is provided with a liquid level meter L1, the first outlet of the absorber is connected to one end of the circulation pump M1, a thermometer T8 is arranged between the first outlet of the absorber and one end of the circulation pump M1, the other end of the circulation pump M1 is connected to the second inlet of the medium-pressure absorber through a one-way valve, the second outlet of the medium-pressure absorber is connected to the first inlet of the generator, the first outlet of the medium-pressure absorber is connected to one end of the defrost valve V5, the other end of the defrost valve V5 is connected to the first inlet of the evaporator, and the generator is provided with a pressure gauge P1;

[0027] The ammonia working medium cycle includes the generator being connected to the first inlet of the rectifier through a two-way pipeline, the first outlet of the rectifier being connected to the first inlet of the condenser, the first outlet of the condenser being connected to the first inlet of the subcooler, the first outlet of the subcooler being connected to one end of the electronic expansion valve V2, the other end of the electronic expansion valve V2 being connected to the first inlet of the medium-pressure evaporator, the first outlet of the medium-pressure evaporator being connected to the first inlet of the separator, the first outlet of the separator being connected to one end of the electronic expansion valve V1, the other end of the electronic expansion valve V1 being connected to one end of the evaporator, a pressure gauge P3 and a thermometer T2 being arranged between the other end of the electronic expansion valve V1 and one end of the evaporator, the other end of the evaporator being connected to the second inlet of the subcooler, a thermometer T3 being arranged between the other end of the evaporator and the second inlet of the subcooler, the second outlet of the subcooler being connected to the second inlet of the absorber, the second outlet of the separator being connected to the third inlet of the medium-pressure absorber through a one-way valve, the separator being provided with a pressure gauge P2 and a liquid level gauge L2, and the evaporator being provided with a thermometer T6;

[0028] The gas-flue gas process includes a gas inlet connected to one end of the burner, the other end of the burner connected to the second inlet of the generator, the second outlet of the generator connected to the first inlet of the flue gas heat exchanger, the first outlet of the flue gas heat exchanger connected to the second inlet of the medium-pressure evaporator, and the second outlet of the medium-pressure evaporator connected to the flue gas outlet;

[0029] The water supply and return cycle includes a water return port connected to the second inlet of the condenser, a thermometer T4 is provided at the water return port, the second outlet of the condenser is connected to the third inlet of the absorber, the second outlet of the absorber is connected to the second inlet of the rectifier, the second outlet of the rectifier is connected to the second inlet of the flue gas heat exchanger, the second outlet of the flue gas heat exchanger is connected to the water supply port, and a thermometer T5 and a water flow meter F1 are provided at the water supply port;

[0030] Among them, the solution circulation description is as follows: the concentrated solution is heated by flue gas in the generator, and part of the ammonia evaporates to become a dilute solution; under the action of pressure, the dilute solution flows from the generator through V4 to the medium-pressure absorber; in the medium-pressure absorber, the dilute solution exchanges heat with the concentrated solution returned to the generator. After the heat exchange, the dilute solution is led to defrost, that is, through the solenoid valve V5 to the evaporator, heating the evaporator to achieve the defrost function; the main path of the dilute solution flows into the absorber through the V3 valve; in the absorber, the dilute solution absorbs ammonia vapor, the solution concentration increases to form a concentrated solution, and releases heat; after heat exchange with the circulating water, the concentrated solution is pressurized by the solution pump and flows into the medium-pressure absorber, and then flows back to the generator after heat exchange with the high-temperature dilute solution. In the solution circulation, by maintaining the stability of the absorber L1 liquid level, the balance between the absorber solution and the absorber solution is ensured, and a stable solution circulation flow is achieved. By controlling the opening of the V3 valve, the flow rate of the solution entering the absorber is adjusted, and then the size of the solution circulation flow is controlled; the size of the intermediate pressure P2 is controlled by adjusting the V3 valve. The absorber liquid level PID control loop is introduced into the solution circulation loop.

[0031] Ammonia working medium cycle description: High-temperature ammonia vapor exchanges heat with circulating water through a rectifier and is purified; ammonia vapor exchanges heat with low-temperature circulating water through a condenser and is liquefied; after liquefaction, the ammonia working medium passes through a cooler to form supercooled liquid ammonia; the supercooled liquid ammonia passes through a medium-pressure evaporator to absorb the waste heat of flue gas; the liquid ammonia working medium heated by the flue gas partially evaporates in the separator; the evaporated ammonia in the separator flows into the medium-pressure absorber through a one-way valve and is absorbed by the medium-pressure dilute solution; the liquid ammonia in the separator is throttled and expanded by the electronic expansion valve V1 to form a low-pressure and low-temperature liquid ammonia working medium; the ammonia working medium evaporates at a low temperature in the evaporator, absorbs heat energy in the air, and becomes ammonia vapor at a higher temperature; after passing through the supercooler, the ammonia vapor enters the absorber; in the absorber, the ammonia vapor is absorbed by the dilute solution, and the ammonia working medium and the dilute solution are mixed to release heat; after heat exchange with the circulating water, it becomes a concentrated solution at a lower temperature, which is pressurized by a pump and returned to the generator through the medium-pressure absorber to complete the ammonia working medium cycle. By adjusting the opening of the electronic expansion valve V1, the evaporation amount of ammonia can be adjusted. Under the premise of keeping the solution flow unchanged, the evaporation temperature can be adjusted by adjusting the P3 pressure. In the working fluid circulation loop, the evaporation temperature PID control loop is introduced.

[0032] Gas-flue gas process: The gas flows into the burner and generates high-temperature flue gas after combustion; the high-temperature flue gas heats the concentrated solution in the generator; the flue gas with waste heat exchanges heat with the supply and return water through the flue gas heat exchanger; the low-temperature flue exchanges heat with the intermediate evaporator to complete the recovery of flue gas waste heat.

[0033] Description of the supply and return water cycle: The circulating water (temperature T4) enters the condenser, condenses the ammonia vapor into liquid ammonia, takes away the heat, and the circulating water temperature rises; the circulating water exchanges heat with concentrated ammonia water in the absorber, and the temperature rises further; the circulating water flows through the rectifier to purify the purity of the ammonia working fluid, takes away the rectification heat, and the supply water temperature rises; the circulating water flows through the flue gas heat exchanger, absorbs the flue gas waste heat, and the supply water temperature rises to T5. With the system supply water temperature T5 as the process quantity, T5_SV as the temperature target value, and the burner as the actuator, the supply water temperature PID control loop is introduced.

[0034] See also Figure 2 As shown, Figure 2 A flow chart of a gas absorption heat pump system control method provided in one embodiment of the present invention includes the following steps:

[0035] Step S101: using the absorber liquid level PID control loop to control the solution circulation;

[0036] Step S102: using an evaporation temperature PID control loop to control the ammonia working medium circulation;

[0037] Step S103: adopting the water supply temperature PID control loop to control the supply and return water circulation to achieve variable working condition and variable power adaptive operation.

[0038] In this embodiment, it is first necessary to control the gas absorption heat pump system to start. The method of starting or closing the gas absorption heat pump system is as follows: the startup parameter setting: after issuing the startup command, set the startup burner opening, electronic expansion valve V1 opening, electronic expansion valve V2 opening, electronic expansion valve V3 opening, electronic expansion valve V4 opening, absorber liquid level target opening L1_SV_start. Solution circulation loop control: Check whether the circulating water flow F1 is normal; after the system detects the supply and return water flow, it turns on the burner and evaporator fan; the high-temperature gas heats the concentrated solution in the generator, the P1 pressure increases, and the solution in the generator flows through V4, the medium-pressure absorber, V3, and flows into the absorber under the action of pressure, and the L1 liquid level begins to rise slowly; the L1 liquid level is greater than the preset value L1_SV_start, the circulation pump M1 is started, and the liquid level automatic control mode is turned on; the L1 liquid level is less than the preset value L1_SV_start, the burner runs for more than 2 minutes, the circulation pump M1 is started, and the liquid level automatic control mode is turned on; the solution in the absorber is pressurized by the solution pump, flows through the medium-pressure absorber, and refluxes to the generator to establish a solution circulation. Ammonia working fluid circulation control: During the startup process, the medium-pressure working fluid valve V2 and the low-pressure working fluid valve V1 are in the open state to ensure smooth working fluid flow. Flue gas process: After the burner is turned on, the gas burns to produce high-temperature flue gas, which heats the generator solution. The flue gas waste heat is further recovered in the flue gas heat exchanger and the intermediate evaporator, and finally discharged into the atmosphere; if the T1 temperature and P1 pressure exceed the preset value, the burner stops; supply and return water circulation control: the supply and return water are powered by the customer's water supply system. The heat pump system can start working normally only after detecting the supply and return water flow; during the normal operation of the unit, if the supply and return water flow is detected to be zero, the system will automatically shut down. The P1-P3 pressure difference is greater than 0.8MPa, the solution circulation can run stably, the T2 temperature matches the P3 pressure saturation temperature T_P3, the working fluid circuit can run stably, and the system startup is completed. Shutdown control process: After issuing the shutdown command, turn off the burner; the solution circulation loop continues to run, and if P1<1.0MPa and T1<100℃ are detected, the solution pump is directly turned off; otherwise, the burner is turned off for 30 minutes, and the solution pump M1 is turned off; the fan is turned off; and the electronic expansion valves V1 and V2 are turned off.

[0039] Specifically, the gas absorption heat pump system introduces three control loops, namely, the evaporation temperature PID control loop, the absorber liquid level PID control loop, and the water supply temperature PID control loop. Among them, the evaporation temperature control loop uses T2 as the process quantity, T2_SV as the target temperature, and V1 as the regulating actuator to realize the working medium circulation control. Automatic adjustment of evaporation temperature T2: the average temperature of the T6 stage minus an offset is used as the set value T2_SV to realize automatic adjustment of evaporation temperature. Among them, the absorber liquid level control loop uses L1 as the process quantity, L1_SV as the target liquid level, and the solution pump M1 as the regulating actuator to realize solution circulation control. Automatic adjustment of absorber liquid level L1: the absorber liquid level L1 base set value L1_base minus the average liquid level value of the separator in a fixed time period is used as the set value L1_SV to realize the balance control of the absorber, generator, and separator liquid levels. Among them, the water supply temperature control loop uses T5 as the process quantity, T5_SV as the target temperature, and the burner FR as the regulating actuator to realize the temperature control of the supply and return water loops. Set the water supply temperature set value T5_SV, obtain the burner benchmark output value through PID automatic mode adjustment, obtain the deviation between the T5 average value and the set temperature value through long-term calculation in manual mode, and correct the burner power in proportion to achieve automatic control of water supply temperature. After the system is started, variable working conditions and variable power adaptive operation are achieved through the linkage control and defrost control of the three PID control loops.

[0040] The three-circuit linkage control and defrost control process are as follows:

[0041] After the system is started, the water supply temperature P ID control loop is set to automatic mode, and the water supply target temperature set value T5_SV is set; the evaporation temperature P ID control loop is set to automatic mode, and the evaporation temperature set value T2_SV automatically follows the average value of the ambient temperature T6 minus 10°C; the L1_SV of the absorber liquid level P ID control loop decreases in the opposite direction as the separator liquid level L2 increases, and the minimum is not less than L1_min;

[0042] After running for 60 minutes, the burner opening average FR_AVG1, the supply and return water temperature difference Δ_T4T5, the supply and return water PID control loop is set to manual, and the gas opening is set to FR_AVG1; the V1 opening average V1_AVG is calculated, the V1 opening upper limit V1_max is set to V1_AVG+20, and the V1 opening lower limit V1_min is set to V1_AVG-20; the L2 liquid level average L2_AVG is calculated;

[0043] The average value of T5 is calculated every 60 minutes, and the difference between it and T5_SV is calculated to obtain Δ_T5=T5_SV-T5_AVG, and the burner opening is set to FR=FR*(1+Δ_T5 / Δ_T4T5); the average value of V1 opening V1_AVG is calculated, the upper limit V1_max of V1 opening is set to V1_AVG+20, and the lower limit V1_min of V1 opening is set to V1_AVG-20; the average value L2_AVG of L2 liquid level is calculated, and the difference Δ_L2 with the last L2 average value is calculated, and L1_SV is reversely increased by Δ_L2.

[0044] After the system is started up, the average values ​​of T6, T2, and T3, T6_AVG, T2_AVG, and T3_AVG, are calculated every 60 minutes to make a defrost judgment. If T6_AVG<0℃ and Δ_T3T2<1℃, the conditions are met, the defrost valve is opened, and the evaporation temperature control loop is set to manual. The timing starts when T3>15℃ and the timing lasts for 30 minutes. The defrost valve is closed and the timing runs for 30 minutes before the system recovers.

[0045] See also Figure 3 As shown, in one embodiment, a gas absorption heat pump system control device is provided, the device comprising:

[0046] A first control module 10 is used to control the solution circulation by using an absorber liquid level PID control loop;

[0047] The second control module 20 is used to control the ammonia working medium cycle by using an evaporation temperature PID control loop;

[0048] The third control module 30 is used to control the supply and return water circulation by adopting the water supply temperature PID control loop to achieve variable working condition and variable power adaptive operation.

[0049] In one embodiment, a gas absorption heat pump system is provided, and its internal structure diagram can be shown as follows: Figure 4 As shown. The gas absorption heat pump system includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the gas absorption heat pump system is used to provide computing and control capabilities. The memory of the gas absorption heat pump system includes a non-volatile and / or volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the gas absorption heat pump system is used to communicate with an external client through a network connection. When the computer program is executed by the processor, the functions or steps of a gas absorption heat pump system control method are implemented.

[0050] In one embodiment, a gas absorption heat pump system is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0051] The absorber liquid level PID control loop is used to control the solution circulation;

[0052] The evaporation temperature PID control loop is used to control the ammonia working medium cycle;

[0053] The water supply temperature PID control loop is used to control the supply and return water circulation.

[0054] The control method for the gas absorption heat pump system proposed in this embodiment controls the solution circulation by adopting the absorber liquid level PID control loop, controls the ammonia working medium circulation by adopting the evaporation temperature PID control loop, and controls the supply and return water circulation by adopting the water supply temperature PID control loop, so as to realize adaptive operation under variable working conditions and variable powers, add key regulating valves and multiple key liquid level, temperature, pressure and flow sensors to the system; introduce the linkage control of three loops of evaporation temperature control, absorber liquid level control and water supply temperature control, realize adaptive control of the system, automatically adjust the efficient operation with the change of ambient temperature and the change of heating power demand, and realize efficient defrost control and start and stop control.

[0055] In one embodiment, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0056] The absorber liquid level PID control loop is used to control the solution circulation;

[0057] The evaporation temperature PID control loop is used to control the ammonia working medium cycle;

[0058] The water supply temperature PID control loop is used to control the supply and return water circulation.

[0059] The control method for the gas absorption heat pump system proposed in this embodiment controls the solution circulation by adopting the absorber liquid level PID control loop, controls the ammonia working medium circulation by adopting the evaporation temperature PID control loop, and controls the supply and return water circulation by adopting the water supply temperature PID control loop, so as to realize adaptive operation under variable working conditions and variable powers, add key regulating valves and multiple key liquid level, temperature, pressure and flow sensors to the system; introduce the linkage control of three loops of evaporation temperature control, absorber liquid level control and water supply temperature control, realize adaptive control of the system, automatically adjust the efficient operation with the change of ambient temperature and the change of heating power demand, and realize efficient defrost control and start and stop control.

[0060] It should be noted that the functions or steps that can be implemented by the above-mentioned computer-readable storage medium or gas absorption heat pump system can be correspondingly referred to the relevant descriptions on the server side and the client side in the aforementioned method embodiment. To avoid repetition, they will not be described one by one here.

[0061] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing related hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct RAMbus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0062] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0063] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A gas absorption heat pump system control method, characterized in that: The gas absorption heat pump system comprises: solution circulation, ammonia working medium circulation, gas-flue gas process, and supply and return water circulation; The solution circulation includes that the first outlet of the generator is connected to one end of the electronic expansion valve V4, a thermometer T1 is arranged between the first outlet of the generator and one end of the electronic expansion valve V4, the other end of the electronic expansion valve V4 is connected to the first inlet of the medium-pressure absorber, the first outlet of the medium-pressure absorber is connected to one end of the electronic expansion valve V3, a thermometer T7 is arranged between the first outlet of the medium-pressure absorber and one end of the electronic expansion valve V3, the other end of the electronic expansion valve V3 is connected to the first inlet of the absorber, the absorber is provided with a liquid level meter L1, the first outlet of the absorber is connected to one end of the circulation pump M1, a thermometer T8 is arranged between the first outlet of the absorber and one end of the circulation pump M1, the other end of the circulation pump M1 is connected to the second inlet of the medium-pressure absorber through a one-way valve, the second outlet of the medium-pressure absorber is connected to the first inlet of the generator, the first outlet of the medium-pressure absorber is connected to one end of the defrost valve V5, the other end of the defrost valve V5 is connected to the first inlet of the evaporator, and the generator is provided with a pressure gauge P1; The ammonia working medium cycle includes the generator being connected to the first inlet of the rectifier through a two-way pipeline, the first outlet of the rectifier being connected to the first inlet of the condenser, the first outlet of the condenser being connected to the first inlet of the subcooler, the first outlet of the subcooler being connected to one end of the electronic expansion valve V2, the other end of the electronic expansion valve V2 being connected to the first inlet of the medium-pressure evaporator, the first outlet of the medium-pressure evaporator being connected to the first inlet of the separator, the first outlet of the separator being connected to one end of the electronic expansion valve V1, the other end of the electronic expansion valve V1 being connected to one end of the evaporator, a pressure gauge P3 and a thermometer T2 being arranged between the other end of the electronic expansion valve V1 and one end of the evaporator, the other end of the evaporator being connected to the second inlet of the subcooler, a thermometer T3 being arranged between the other end of the evaporator and the second inlet of the subcooler, the second outlet of the subcooler being connected to the second inlet of the absorber, the second outlet of the separator being connected to the third inlet of the medium-pressure absorber through a one-way valve, the separator being provided with a pressure gauge P2 and a liquid level gauge L2, and the evaporator being provided with a thermometer T6; The gas-flue gas process includes a gas inlet connected to one end of the burner, the other end of the burner connected to the second inlet of the generator, the second outlet of the generator connected to the first inlet of the flue gas heat exchanger, the first outlet of the flue gas heat exchanger connected to the second inlet of the medium-pressure evaporator, and the second outlet of the medium-pressure evaporator connected to the flue gas outlet; The water supply and return cycle includes a water return port connected to the second inlet of the condenser, a thermometer T4 is provided at the water return port, the second outlet of the condenser is connected to the third inlet of the absorber, the second outlet of the absorber is connected to the second inlet of the rectifier, the second outlet of the rectifier is connected to the second inlet of the flue gas heat exchanger, the second outlet of the flue gas heat exchanger is connected to the water supply port, and a thermometer T5 and a water flow meter F1 are provided at the water supply port; The gas absorption heat pump system control method comprises: Adopt absorber liquid level PID control loop to control solution circulation; The evaporation temperature PID control loop is used to control the ammonia working medium cycle; The water supply temperature PID control loop is used to control the supply and return water circulation to achieve adaptive operation under variable operating conditions and variable power.

2. A gas absorption heat pump system control device, characterized in that: The gas absorption heat pump system control device comprises: A first control module is used to control the solution circulation by using an absorber liquid level PID control loop; The second control module is used to control the ammonia working medium circulation by adopting the evaporation temperature PID control loop; The third control module is used to control the supply and return water circulation by adopting the water supply temperature PID control loop to achieve variable working condition and variable power adaptive operation.

3. A gas absorption heat pump system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the gas absorption heat pump system control method as claimed in claim 1 are implemented.

4. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the gas absorption heat pump system control method as claimed in claim 1 are implemented.

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